By Tycho Brahe wore an excellent mustache, but his namesake doesn’t make the sort of music I associate with robust facial hair. Tycho, a.k.a. San Francisco producer Scott Hansen, trades in atmospheric electronic tracks, the kind fit for soundtracking footage of space. (You know, that vast, barely explored expanse beyond our atmosphere — the one Brahe charted so accurately all those centuries ago.) For such airy stuff, it’s surprisingly gripping.